[LEAPSECS] What happened in the late 1990s to slow the rate of leap seconds?

[Poul-Henning Kamp]

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In message <20151109025137.A95A840605C at ip-64-139-1-69.sjc.megapath.net>, Hal Murray write
s:
>There is a nice graph here:
>  http://hpiers.obspm.fr/eop-pc/earthor/utc/leapsecond.html
>
>Was there a geological incident that explains things?

We don't know, but the period had other pecularities, for instance almost
statistically significant level of vulcanism.

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